SAN FRANCISCO (CBS SF) — About 2,500 past and present San Francisco Municipal Railway drivers have been certified as a class in a federal lawsuit alleging Muni has not paid them the overtime hours they have put in, according to a report.

The SF Weekly reported drivers who have operated buses, light rail vehicles, trolleys or cable cars since July 2009 are part of the lawsuit claiming they are paid on a predetermined amount of driving time despite routes that make it impossible to stay on schedule.

The lawsuit alleges Muni does not compensate drivers for time spent performing vehicle inspections, transferring from one vehicle to another while switching runs, or returning to personal vehicles after the last run of the day, the SF Weekly said.

The report said the lawsuit also alleges Muni has not adhered to the city’s Minimum Wage Ordinance – even though Muni drivers are paid significantly more than minimum wage – since the claim alleges non-payment during certain time periods.